Brake mounting



Aug. 27,1929.

J; SNEED BRAKE MOUNTING Filed June 8, 1927 Q mtaw s I 25 which are out of phase with the no turn is secured to the'plate.

Patented Aug. 21,1929.

UNITED STA 1,726,045 Tas PATENT OFFICLI JOHN SNEED, OF DETROIT, MICHIGAN, ASSIGNOB TO THE MIDLAND STEEL PRODUCTS COMPANY, OF CLEVELAND, OHIO, A. CORPORATION 01' OHIO. H

, BRAKE nounrme.

Application filed June a,

'This invention relates to brakes and is illustrated as embodied in a backing plate for an automobile brake.

, An object of the invention is to prevent 5 the buildingup of vibrations in the plate which would otherwise cause an annoying sound, frequently termed drumming.

It has been found'that when a brake is in operation, that is, when the shoe 'is in contact with the brake drum, that the shoe delivers to the anchor pin or to such brake applying meansas will stand in a similar relation, a vibratibn which, when transmitted to the backing plate cause the plate to 16 vibrate so as to give forth a sound, the pitch of which depends upon both the pressure of brake application and the sound characteristic of the plate. T

. It is among the objects of my invention 20 to cleaden the vibrations in the anchor plate by dampening the vibration near the point where it is set up by the anchor pin or other means, on one hand, and on the other hand by delivering to the backingplate -vibrat1o ns original v1- bration and tend to-negative the vibration so that the dr, 'ng is eliminated.

- Other objects will appear from the following more detailed description of my invention. The essential characteristics are sum marized inthe claims.

Fig. 1 is a front elevation of an illustrative brake backing late with an' anchor carrying bracket secure thereto; Fig. 2.,is a section of line 2 -2 on- Fig. 1.

In illustrating my invention, I have shown one anchor pin which extends through and may be in contact with the baclnn plate and is carried by a bracket, which racket 111 Thus, in the drawings, I show the plate 10 to whih 's secured the bracket 11. The bracket, in turn, carries the pin 12. The pin is fixed to the bracket as at-13 and the preferred form of my inv' ntion may be in close contact with the pla eat thejopenin 14.

Suitable rivets 15 or other means hol the bracket to the plate.

Disposed between the bracket and the plate, I provide a sheet of material 20 which has difierent Physical characteristics from the material 0 the plate. The sheet 20 may be made of. rubber, leather, paper pulp or other material which willgnot vibrate in cona brake,

1921. berm No. 197,330. 7

contact with the plate at 14 and furthermore,

the rivets 15 may deliver vibrations directly to the plate so that the function of the sheet 20 inthis event, is to transmit vibrations to and from the bracket and the plate', but to 'do so to effect both a lag and a dampening in the delivery which will result in the breaking up or opposition to. the vibrations of the plate.

It has been found that the anchor pin delivers its vibration to the late in the plane of the plate which vibrat ons in turn, appear. normal to the plate at the oint more or less' remotefrom the pin. T e sheet 20- being in close engagement with the plate at a point where the vibrations, are strongest in the plane of the plate, tends of course, to dampen the source of plate vibration by rea-' son of its extended area of contact with the plate at'this point.

While. one illustrative embodiment has been described, it. is not my intention to limit the scope of the invention other than by the terms of the appended claims.

--Iclaim: 1. A backing plate for a brake ada ted to carry an anchor in, and material avin vibration dampening characteristics secure to the plate over an, area adjacent the point of engagement between the plate and said pin. Y

2. The combination of-a backing plate for .a brake, an'anchor in carried thereby, and material having di erent physical vibration characteristics r om the plate and secured to.

the plate adjacent the point of engagement between the plate and said pin.

3. The combination of a backing plate for brake anchoring means, a bracket adapted to carry said anchoring means and material havin different physical characteristics from t 6 plate secured between the bracket and plate for dampening vibration.

4:. The combination ofv a backing-plate for a brake, a bracket adapted to take r ing reaction and a shim of material having ing torque is transmitted to the plate, a different physical characteristics from .the sheet of material having difi'erent hysical 1 plate and positioned between the bracket characteristics and being secured etween and said plate to prevent vibration. the bracket and the plate, and means having 5 5. The combination of a backing plate f0 physical characteristics similar to the plate a brake, an anchor pin in contact therewith, and engaging the plate and the bracket a bracket adapted to carry said anchor pin whereby vibrations are delivered from the 20 andashim of material having different physbracket to the plate in different phases to icalcharacteristics from the plate and seneutralize vibration therein. I 10 cured between the bracket andiplate for neu- In testimonywhereof, I hbreunto aflix my tralizing vibration in the plate. signature. 7 6. In combination a backing plate for a brake, a bracket through which brake react- JOHN SNEED. 

